摘要
近年来,扬声器阵列由于能产生指向性声束而得到越来越多的关注和研究,在家电产品中也得到了日益广泛的应用,平板电视如何利用超薄扬声器阵列产生指向性声束成为当前热点。在1 kHz的条件下,分别对均匀分布、二项分布、三角分布、倒三角分布以及Dolph-Chebyshev加权5个不同的幅值分布算法进行了仿真和分析。结果表明,不同的幅值加权算法,对于扬声器阵列波束形成有显著影响。其中,Dolph-Chebyshev加权在主波束宽度和旁瓣级之间做了很好的折中,是扬声器阵列直线阵中的一种比较理想的幅值加权方式。最后,对Dolph-Chebyshev加权进行了实验,进一步进行了论证。
In the recent years, loudspeaker array has been widely considered and used in household appliance products. For the fiat - panel TV, how to use the ultra - thin loudspeaker array to generate a directional beam is becoming the current research focus. In this paper, the beamforming effects of linear loudspeaker array with different feeding distributions are compared. The simulation configures 7 loudspeakers in a line with a gap of 14cm. Its directional diagrams under lkHz are examined with 5 types of feeding distributions, which include the uniform, binomial, triangular, inverted triangular and Dolph - Chebyshev distributions. The simulation shows that the linear loudspeaker array beamforming is significantly impacted by the feeding distributions and Dolph - Chebyshev distribution has the ideal performance in beamforming, which is because it makes a good compromise between the main lobe width and the side lobe height.
出处
《电声技术》
2013年第6期31-34,45,共5页
Audio Engineering
